clientpq.cpp
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- /****************************************************************************
- *
- * Client side Priority Queue Time-Based Scheduler.
- * Out there protecting the world!
- *
- */
- #include "clientpq.h"
- #include "hxthread.h"
- #include "hxheap.h"
- #ifdef _DEBUG
- #undef HX_THIS_FILE
- static const char HX_THIS_FILE[] = __FILE__;
- #endif
- ClientPQ::ClientPQ(CHXID* pIds)
- : PQ(pIds),
- m_pFreeList(NULL),
- m_uNumFreeNodes(0),
- m_uNumNodesToCache(DEFAULT_NODE_CACHE_SIZE),
- m_pMutex(NULL)
- {
- #if defined(THREADS_SUPPORTED) || defined(_UNIX_THREADS_SUPPORTED)
- HXMutex::MakeMutex(m_pMutex);
- #else
- HXMutex::MakeStubMutex(m_pMutex);
- #endif
- }
- ClientPQ::~ClientPQ()
- {
- while(m_pFreeList)
- {
- PQElem* pElem = m_pFreeList;
- m_pFreeList = m_pFreeList->m_pNext;
- delete pElem;
- }
- HX_DELETE(m_pMutex);
- }
- int ClientPQ::execute(Timeval now)
- {
- int nCount = 0;
- PQElem* pElem = NULL;
-
- //Protect just the _remove_head call with the mutex.
- m_pMutex->Lock();
- pElem = PQ::get_execute_list(now);
- PQElem* pElemNext = NULL;
- while (pElem)
- {
- // synch with remove.
- pElem->m_bRemoved = TRUE;
- if(!pElem->m_bDefunct)
- nCount++;
- m_pMutex->Unlock();
- pElemNext = PQ::dispatch_element(pElem);
- m_pMutex->Lock();
-
- PQ::destroy_element(pElem);
- if (!pElemNext)
- break;
- pElem = pElemNext;
- }
- m_pMutex->Unlock();
- return nCount;
- }
- UINT32 ClientPQ::enter(Timeval tmVal, IHXCallback* pCallBack)
- {
- UINT32 unRetVal = 0;
- m_pMutex->Lock();
- unRetVal = PQ::enter(tmVal, pCallBack);
- m_pMutex->Unlock();
- return unRetVal;
- }
- BOOL ClientPQ::removeifexists(UINT32 id)
- {
- BOOL bReturn = FALSE;
- m_pMutex->Lock();
-
- PQElem* pElem = (PQElem*)m_pIds->get(id);
- if( pElem && !pElem->m_bRemoved)
- {
- bReturn = PQ::removeifexists(id);
- pElem->m_bRemoved = bReturn;
- }
- m_pMutex->Unlock();
-
- return bReturn;
- }
- void
- ClientPQ::remove(UINT32 id)
- {
- m_pMutex->Lock();
- PQElem* pElem = (PQElem*)m_pIds->get(id);
- if (pElem && !pElem->m_bRemoved)
- {
- HX_VERIFY(PQ::removeifexists(id) == TRUE);
- pElem->m_bRemoved = 1;
- }
- m_pMutex->Unlock();
- //HX_VERIFY(removeifexists(id) == TRUE);
- }